1、BRITISH STANDARD BS6591:1985 ISO5612:1984 Specification for Scraper bars for chain conveyors for mining ISO title: Mining Scraper bars for chain conveyors UDC 622.647.53:621.867.137.064BS6591:1985 This BritishStandard, having been prepared under the directionof the Mining and Quarrying Requisites St
2、andards Committee, waspublished underthe authority of the BoardofBSI and comes into effect on 31 May1985 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference MQE/6 Draft for comment82/79442 DC ISBN 0 580 14434 8 Committees responsible for this BritishStand
3、ard The preparation of this BritishStandard was entrusted by the Mining and Quarrying Requisites Standards Committee (MQE/-) to Technical Committee MQE/6, upon which the following bodies were represented: Association of British Mining Equipment Companies British Chain Manufacturers Association Briti
4、sh Valve Manufacturers Association Ltd. Health and Safety Executive Institution of Mining Engineers National Coal Board Amendments issued since publication Amd. No. Date of issue CommentsBS6591:1985 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope an
5、d field of application 1 2 References 1 3 Definitions 1 4 Material 1 5 Heat treatment 1 6 Dimensions 1 7 Sampling and testing 2 8 Inspection procedure 4 Figure 1 Dimensions of “T” scraper bars 2 Figure 2 Dimensions of “I” scraper bars 2 Table 1 Dimensions of scraper bars 3 Table 2 Strength rating of
6、 scraper bars Minimum force 4 Publications referred to Inside back coverBS6591:1985 ii BSI 12-1999 National foreword This BritishStandard has been prepared under the direction of the Mining and Quarrying Requisites Standards Committee and is identical with ISO5612:1984 “Mining Scraper bars for chain
7、 conveyors” published by the International Organization for Standardization (ISO). The United Kingdom has taken part in the preparation of the International Standard through Sub-committee2 of Technical Committee82 of the International Organization for Standardization (ISO). Terminology and conventio
8、ns. The text of the International Standard has been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not identical with those used in BritishStandards; attention is drawn especially to the following. The comma has been used as
9、a decimal marker. In BritishStandards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “BritishStandard”. It should be noted that where reference is made in the tex
10、t to “l” bars, this should read “I” bars to indicate the shape of the section. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself co
11、nfer immunity from legal obligations. Cross-references International Standard Corresponding BritishStandard ISO/R147:1960 BS1610:1964 Methods for the load verification of testing machines (Technically equivalent) ISO610:1979 BS2969:1980 Specification for high tensile steel chains (round link) for ch
12、ain conveyors and coal ploughs (Identical) ISO1082:1984 BS4831:1985 Specification for shackle type connector units for chain conveyors for mining (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4, an inside back cover and a back cover
13、. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS6591:1985 BSI 12-1999 1 1 Scope and field of application This International Standard specifies the requirements for a range of scr
14、aper bars for use in twin outboard chain assemblies made from chains complying with ISO610 and associated shackle type connectors complying with ISO1082. The range of scraper bars specified is intended for use with chains of diameter14,18,22,24 and26mm in a selected range of chain centres and is cla
15、mped tight within the shackle type connectors. This International Standard is not intended to indicate a complete design, but gives sufficient detail to ensure dimensional compatibility with the associated chains and connectors. Dimensions of section ends of the scraper bars necessary for compatibil
16、ity between scraper bars and connectors are specified. The centre sections of the scraper bars may be of any design and shape, within the range of dimensions given in Table 1 for the appropriate chain centres. Other dimensions may be subject to national standards or agreement between the purchaser a
17、nd the manufacturer. As a guide to the selection of scraper bars for specific applications, scraper bars are rated by determining the force at which a specified minimum deflection is attained, when the bar is subjected to a three-point bend test. The bars can be classified as “light”, “medium” or “h
18、eavy”, according to their strength ratings. 2 References ISO/R147, Load calibration of testing machines for tensile testing of steel. ISO610, High-tensile steel chains (round link) for chain conveyors and coal ploughs. ISO1082, Mining Shackle type connector units for chain conveyors. 3 Definitions F
19、or the purpose of this International Standard, the following definitions apply. 3.1 twin outboard chain assembly pairs of chains to which scraper bars are coupled by means of shackle type connectors 3.2 nominal chain centres the distance between the centres of the chains in the assembly 3.3 force-de
20、flection test a test to determine the ability of a scraper bar to sustain a minimum deflection and the strength rating 3.4 minimum deflection the deflection that a scraper bar is required to sustain without fracture 3.5 strength rating the force required to produce a central deflection in the scrape
21、r bar, equal to10% of the nominal chain centres of the assembly 3.6 inspector the representative of the purchaser 4 Material It shall be the responsibility of the manufacturer to select the steel so that the finished scraper bars, suitably heat-treated, where appropriate, meet the specified mechanic
22、al properties. 5 Heat treatment Any heat treatment shall be the responsibility of the manufacturer. 6 Dimensions Scraper bars shall comply with the dimensions specified in Table 1 and illustrated in Figure 1 and Figure 2. The centre sections of the scraper bars may be of any design and shape, within
23、 the range of dimensions given in Table 1 for the appropriate chain centres. All other dimensions shall be chosen to ensure compatibility with other associated equipment, i.e.connector, sprocket, conveyor pans, drives etc.BS6591:1985 2 BSI 12-1999 7 Sampling and testing 7.1 General All test data sha
24、ll be recorded. The testing procedure shall be as follows. 7.2 Selection of samples Unless otherwise specified by the purchaser, the following sampling arrangements shall apply, but this shall not preclude the inspector asking for such further samples as he may deem necessary: a) test samples shall
25、be selected at random; they shall be in the same condition as the bulk of the scraper bars, and free from any coating which might obscure defects; b) for sampling purposes, the scraper bars shall be divided into lots, a lot comprising500 scraper bars; any fraction shall be considered as a complete l
26、ot; c) for dimensional tests, four samples shall be taken from each lot; d) for the force-deflection test, one sample shall be taken from each lot. 7.3 Dimensional tests The dimensions required by clause6 shall be verified. Figure 1 Dimensions of “T” scraper bars NOTEEnds of bars should be suitably
27、relieved by chamfer or other means to avoid interference with sprockets. Figure 2 Dimensions of “I” scraper barsBS 6591:1985 BSI 12-1999 3 Table 1 Dimensions of scraper bars Dimensions in millimetres Nominal size and pitch of chain Nominal chain centres Overall length of bar Hole centres Hole diamet
28、er Lateral clearance Height of bar Web thickness Vertical clearance Location of chamfer “T” bar “I” bar “T” bar “I” bar “T” bar “I” bar A B C D E F G H J max. min. max. min. max. min. min. min. max. max. min. max. max. min. min. max. 14 50 350 400 500 302 352 452 298 348 448 248,5 298,5 398,5 247,5
29、297,5 397,5 17,5 17 19 54 52 17,5 16 12,5 16,5 16 12 9 18 64 400 500 600 650 700 342 442 542 592 642 338 438 538 588 638 290,5 390,5 490,5 540,5 590,5 289,5 389,5 489,5 539,5 589,5 21,5 21 42 61 64 20,5 19 16 22 21,5 15,5 12,5 22 86 450 500 600 650 700 750 362 412 512 562 612 662 358 408 508 558 608
30、 658 300,5 350,5 450,5 500,5 550,5 600,5 299,5 349,5 449,5 499,5 549,5 599,5 25,5 25 46 90 81 24,5 23 20,5 26,5 26 18 15 24 86 600 512 508 444,5 443,5 25,5 25 90 88 23 15 24 87,5 600 512 508 444,5 443,5 25,5 25 90 88 23 15 26 92 500 600 650 700 800 402 502 552 602 702 398 498 548 598 698 330,5 430,5
31、 480,5 530,5 630,5 329,5 429,5 479,5 529,5 629,5 28,5 28 46 95 28 26,5 29,5 29 18,5 BS6591:1985 4 BSI 12-1999 7.4 Force-deflection test 7.4.1 Testing machine The testing machine and loading arrangements used shall be suitable for meeting the requirements of the test procedure. The type and accuracy
32、of the testing machine shall be in accordance with class1 of ISO/R147 or an equivalent national standard. The testing machine shall be used only within the appropriate range as shown by the test certificate for the machine. 7.4.2 Procedure Position the bar with the connector bolt holes lying in the
33、vertical plane and simply supported at the appropriate bolt hole centres. Apply a test force at the mid-point of the span, using appropriately shaped supports and loading pad, rounded on the contact surfaces to a radius of25mm. Carry out the test in a single loading in which the force is gradually i
34、ncreased until the specified central deflection is reached (i.e.equal to10% of the chain centres). Read the force from the testing machine indicator and classify the bar as “light”, “medium”, or “heavy” in accordance with the strength ratings given in Table 2. Each bar tested shall reach the specifi
35、ed minimum deflection with no visible sign of fracture. For classification into a given category, the force reached at the specified minimum deflection shall be at least equal to the appropriate value specified in Table 2, for each class. 8 Inspection procedure 8.1 Acceptance A scraper bar lot shall
36、 be deemed to comply with this International Standard if each of the samples taken from a lot fulfils all the specified test requirements. Should any of the samples fail to meet any one of the specified tests, two further samples shall be selected from the same lot. If both these additional samples
37、meet the specified test requirements, the lot shall be deemed to comply with this International Standard. Should either of the two further samples fail any one of the specified tests, the lot shall be rejected. 8.2 Marking 8.2.1 Identification marking All finished scraper bars shall be legibly marke
38、d to indicate the manufacturer and, by agreement between the purchaser and the manufacturer, any other relevant information. 8.2.2 Inspection marking Provided all specified tests are satisfactory and a lot has been accepted, the inspector shall signify his acceptance. The precise extent and nature o
39、f the inspection marking to be used shall be subject to agreement between the purchaser and the manufacturer. 8.3 Test certificate At the option of the purchaser, the manufacturer shall supply a representative certificate(s) of test and examination with every consignment of scraper bars supplied as
40、conforming to this International Standard; when so agreed between the purchaser and the manufacturer, identification of the cast number of the steel shall be stated. This shall also apply in instances where scraper bars are supplied as part of a complete conveyor chain assembly. The certificate shal
41、l be signed by the manufacturer and by the inspector if he witnessed the inspection tests. 8.4 General inspection For the purpose of witnessing the tests and inspecting the testing machines and methods of examination, the inspector shall be given access to the relevant parts of the works of the manu
42、facturer at all reasonable times. Table 2 Strength rating of scraper bars Minimum force a Nominal size and pitch of chain Strength rating Light Medium Heavy mm Minimum force, kN 14 50 18 64 22 86 24 86 24 87,5 26 92 35 60 90 105 105 125 75 125 185 215 215 255 150 250 370 430 430 510 a These values a
43、pproximate to7,5% (light),15% (medium) and30% (heavy) of the gross chain strength, i.e.twice the minimum breaking force for grade C chain as specified in ISO610.BS6591:1985 BSI 12-1999 Publications referred to See national foreword.BS6591:1985 ISO5612:1984 BSI 389 Chiswick High Road London W4 4AL BS
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